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// Copyright 2013 the V8 project authors. All rights reserved.
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import 'v8_regexp_utils.dart';
import 'package:expect/expect.dart';

void main() {
  description(
    'Tests that regular expressions treat non-BMP characters as two separate characters. ' +
        'From a Unicode correctness point of view this is wrong, but it is what other browsers do. ' +
        'And given that we store strings as UTF-16, it is also more efficient to implement. ' +
        'Also test some other cases related to UTF-8 and UTF-16.',
  );

  var surrogatePair =
      new String.fromCharCode(0xD800) + new String.fromCharCode(0xDC00);

  assertEquals(new RegExp(r".").firstMatch(surrogatePair)!.group(0)!.length, 1);
  assertEquals(
    new RegExp(r"\D").firstMatch(surrogatePair)!.group(0)!.length,
    1,
  );
  assertEquals(
    new RegExp(r"\S").firstMatch(surrogatePair)!.group(0)!.length,
    1,
  );
  assertEquals(
    new RegExp(r"\W").firstMatch(surrogatePair)!.group(0)!.length,
    1,
  );
  assertEquals(
    new RegExp(r"[^x]").firstMatch(surrogatePair)!.group(0)!.length,
    1,
  );

  assertEquals(
    new RegExp(
      r".{1,2}",
    ).firstMatch("!!" + new String.fromCharCode(0xA1))!.group(0)!.length,
    2,
  );
  shouldBeNull(new RegExp(r".").firstMatch(""));
}
